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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ad68d73d4fc43d8727cfa1c84c9d6ce3a749d999cfbdfccd9128e2ec59c72b' 
  AND token = 'U8X9xZJPRzpocm6SmGzRMZ2x0xvTrXQbpOB7RbJvTpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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