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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f09872c361d6bccdadec0a3d695cbeaaf8d1646373a6c16971955ff7d299478' 
  AND token = 'gYRN6tjl5EiXLPdGyABDZ9Mvy+UijIyZnjNVQQQlenU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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