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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9be10b442de3f8bb8cea501cc41947c8b5748fd02177549a1da42b37c8945da' 
  AND token = 'LjMo/ql6Fmoe1m+cbQ/U+nfgrnlRWOR6MGxvAUJTAEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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