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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c45c237eb24725ee0fc1f7cad532aafcfd9588e9fda8c106a1cc04589bbc0d6f' 
  AND token = 'kUHQhv2ctPaHuo84DgODB/35PS3rpOgqtiJMIHDycn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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