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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324b0a95ed90d4a114bec6702c9e975add465b444f956a61c65ea7b843b96729' 
  AND token = 'o7z9klsGkdaVe8fcqjBXy00/naTipDTt5XYrUlN+a4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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