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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fec9e601b8fe985ec971706e93bdc9aef7ca07a9e4c93c0490d336c2abb0cd1' 
  AND token = 'D9DpAVXI45ghExpnRq9X6aWFcjJn7+8dlBELCp0/cDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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