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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab58a13a303c76d19fbf68527dbb949cadf5ac9eeb9ff7a9f6bb5b3d7585cfd1' 
  AND token = 'd5O9tfGcrscAyooZNnbXSHzVaF++epcE5JVZbOtHf3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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