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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eebac585a12734351c38103a34a980cbd61954b9a4f2da493bc2705fb63092c' 
  AND token = '5MFvJv5EQo5Qjp7eg08V0t+IsjMfW5gsROrpBeLpb+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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