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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffd814ae877ebd5516a1ed357a215a2937a124eb77f49a666cec46574981313' 
  AND token = 'ej3yM7fGGOVo4z31nqu0AeRl2HM1Jjg6t2u6Da3YSTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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