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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2db93273235597f7bf42f1ec72cda44e0aef7af238f593df3a502df1cc007f1' 
  AND token = 'PIJaZC7pJYJzNT8JN3km+0HQ0M5lOFpU82YdZskvz8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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