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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098fdcadbc00efae73e3379af60bcf0494b073c2a8797c00c46cf28c77096e2c' 
  AND token = 'Gc+qKR03sqjB6XgxolFYmSWpyWBjGBG6o8pzP9MnhEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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