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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65029dfb0f009e435f8bdabf079ed0f0d207255ca62721bc6f55a39776892c85' 
  AND token = '7XdthGXlJFSungZK5J09iJJUaCr83naLQ6D8ogmq+bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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