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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087cbbadc3279530f7d356be8a6fc76cbeb98b2ea178ccf9f87399b483a3acab' 
  AND token = 'WkOehd39ldZFN+id5Vs7NgBGw3pdPgeb/QNYP0gGfI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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