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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152db3eb0364ce3dee4fc6c63564ae7a5bb2a78df337be543181233b03f30370' 
  AND token = 'LFORZFwfitHvWw9PO31alpL0ech2v72MxlP5xlqni+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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