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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cab848e0908545efd3b42406a973e79070df535f37b5dbe386ec42d9939a97' 
  AND token = 'qsp21tzRvQLvz8KFw05DW8AQtin0QTmFBu2yD7iMHJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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