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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73934884b477d17ef05f2cdf8218690fc663bcb3891232369e309a68c8f31f7' 
  AND token = 'XQFP5mSZCX0Ouit07TvPBIPxFkzdjXwC27k7HiTeTLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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