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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977a71c2615d1405a9f878d85cf164b36715c45f1857fb784765d893082b25dd' 
  AND token = 'Oa+n/VrPMTF98IavsTPEQEU2LZRW/vDUoeZrXltJvcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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