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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97aab1d95087a3a0bb5c034dc16f303fd1f592fba8bdb1190dc1e63db8165784' 
  AND token = '0KthZ4Z0rye5ufDlmkdCoM4WTTx8TCbD1iosKiQ/fXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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