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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dde550220e6f650c2ab4237dbefcee7c804bd71acb81f2a17c1bf4bd453bd88' 
  AND token = '0GJvl9PygJc0/IQ6mn70OtBs5fZRt45NheBJRHrHtLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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