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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96be28a33a66b2b5976cf17db2555fd4c991e62acc5f4bfda181f162e0c2ad52' 
  AND token = 'zDOO6O4ZyKi3dACjMiHq+yc7WFigvYVOVepd5AKUvyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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