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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd024c5f11e4ba596a70c00d23fd43c27c408a6864212f8579d719b324decfb49' 
  AND token = 'TD/ZFKW34g1/mYD4ZIcO8CpNcxCMpmTSVnmD269jEd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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