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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631626c08bc416e74c7440e7e1e5f68988d85c34dc269e42018ccef08ec96ea3' 
  AND token = 'BsgWV030l+z+WZNZdGdD06tpjC5l4LlMjEAJ/Acd+5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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