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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5bfd9b1e6293252bb28336376c6d882ed0d7e3dd54f443e1ed6776e231c12d' 
  AND token = 'WNTAJkQCOH1XGS+2YPI72MezEjOx/PFClyxoSt+/K6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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