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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e570737817e9afda00042054c7f3e00b8e0e79bc7848b5e6287137efc395d436' 
  AND token = 'atQas0bqVuE3L4RRSVIBb6rCPaLTDcs9RW0RsIirUTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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