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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d32e1033db998fd59f9826cf32e3651aaf9ae193d63218c54c4d54beefb7d19' 
  AND token = '1TEn748pPTGtpspwu6s+32E1yKsrwkncSJRc2s2RvME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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