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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc32c2eeb967caa37a14c1d4219b7edd58064ee0735af4e3649919eef111d92' 
  AND token = '82SLWMlDH1PDaOEK75aOZpSjOe+X8QAlgEWMlL+RTQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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