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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d7601d596dbec2532f1ea60e76f559b2ed7f1bb0f6a52e0251f41679953e37' 
  AND token = 'EkXddJDEx6AoOWkoBr5BchVa96QOYrGAr9rKYhgTuT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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