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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e5e9e591faaf5b6c6d570f32861d3d540acaad455eeb9b1290ed09510dabf3' 
  AND token = 'ie5xrXEGKE7kf/6GJiMP2qwOsx/fneqA7mHjPs/hf8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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