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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd579f3e2607cfc9b905f6dedf80766cd212b881747018e22f1932f7c72452513' 
  AND token = 'CcNfnRXyXlWsNHJVkDR/TsAGfcn+c9FkDaEHCoB8YCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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