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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0e1dae9cc1cc69f83e863239547bf14b54c7bffb6a829b4b585b20a44b4133a' 
  AND token = 'bbf0hte4f43K+nAa86UWmb4+B3g+uXU4e11gtnFQzZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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