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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d6ccf395adc5fd9f2fd8421435774cfa969c8cdb52a105c7a5ab4dfc2ba394c' 
  AND token = 'V6oNMGkMVyiugXPr668dpm+TpxNVirTLZHsytjhVXGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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