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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f13f31746e185ec2c52ee6aebe0ea7247e451d7fee5a814750b509aebc705b0' 
  AND token = 'hYeTCH48Bd+By3BjO67OV2QQBqq0X6DUTaE82iK3Pfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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