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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10a54d5131f670078f89f5fb8888858d28e52345ba74e30e4e87b16b5ebeb34' 
  AND token = 'Gyqi9Txaqyj8WnUFL9LBqhQXKKT2DpETLqecWsupUyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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