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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a04dd8de4cb0d85407b0aed076d35bafe41aa6bcc06c671fe9bc3e5d7069bdce' 
  AND token = 'wcZW7icz0gjokxsCz7C6k4+iIMeB87umjz0/x/Nq2i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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