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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '093be4c1534a5536c881310a0062cdc0dc83cbf05ad854ff255c4f1b428d566c' 
  AND token = 'p+curhMqL3pB69p1/YcRrBQNEWBEQFXWG82IdE1O8oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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