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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c61297941d32e8b15314f8fe056b4b9dee50c6b6f1a8dca83aafdc1480824d' 
  AND token = '1VkQGSEEXKiJ+pLy+jpTKT5srGpaUtE37FARc0J3L3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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