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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9253f539316b9ba689f04565eee81acf374234119b9dfded90a22eb584d5725f' 
  AND token = 'N3x2o0H9ss5xXBgQo2w2rQW4GG5gAzudcpeQunC4oFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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