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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04a00163e4eebfa7a554dfdda0547dce4ef7e6bb3399f966e960089115654317' 
  AND token = '3tlWELj7lDM9K9h/WuxicuXGbdnCtVO1xxnZp0O6LM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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