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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1974fac964c4c87365ebf377c3f258bd237738bdcc33ede8a38c54c7ece790d9' 
  AND token = '1iKERVG1xfUth7bojbUmxKlT2AhK5Y6007j01ZGoyco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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