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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93c5067f90bddd57926e146858a432230fbea06c33b8b2e2789ba8cb97a6d2e' 
  AND token = 'yHKw8xf29HVXe7NLUzYatZaICGGaRA5RfS+zXZPcLmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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