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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8dfafdc6dd5c9f819852c1660f207665b7b8f06abac45fed624c4eed5f2653e' 
  AND token = 'IM8QxyGBzPY0jh5JExtkOaf0qe/XQCzf4HH3wsCEK58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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