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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71fd83f9c556b24c83d7199dbb415c8b7b4af0983a554b0e7448543d6f1ebfd' 
  AND token = '/SfJvY/kRCXJtJP+Ubk1/sjOJk/2veR8ECtYM40mGHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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