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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a2512a6951fb08475d59c70051392fe447b914178c69910d5c47c363f53edb' 
  AND token = 'PsNp3rqjvKrvA6AQJDNH/nGOlKaIuv+r/Jr91n451iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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