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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534f9faa32d37aeee2a24f69a201ea6594574c5808c5e471d4dfb79df6313f2a' 
  AND token = 'Ioio4DNBc4ngqSwBP7HAKcNsYg5B1WatOCWIcmXMaFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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