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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfda6a159cbe364071e9132f8b50ec26d1085b84d0e63f01be9d82fc7ef2229' 
  AND token = 'goaN9RWh8QG/tEg5AUibf/w2KEvuV6TEWXSPQhaZ+/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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