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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e9f7e837f74db9d7161da181be4549c864f941090fcef9f9f3e67da741388c' 
  AND token = 'qr0a7tibaJUgcqYu3rD0+ZcRtT9XvNJRtD+IbaJboK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}