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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503eb91df33f674ff6984b37e243a56ba04af3505f2a063cd479ab31e1971a39' 
  AND token = 'm86ZIZBLy0MnJxXtUntR7RiQI7wViKdZt/jjo/UCMl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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