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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd4ffd84ed07b8622bb4ad6d8920e36b381fe83f89fe7d882f48d369ced42165' 
  AND token = 'tdQh002/jMea4Ud90jlwXr1IVryvWARsO/EXfwB4Yhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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