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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa190795e3d175d86204de235dd341ca828e1856911d74c1620add52bf1634f' 
  AND token = 'w+MXEZnQQsqqKVw+sneix61FmqLIGLWKSwKu4nK5BcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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