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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dd401ce6020407e95b9e6957792de6022cb9a4467a439cd7190dc7c253c212' 
  AND token = 'cNMWQyb+LG7hNmAIF2ebc41htAtmRx7utxgaW9As3Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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