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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ddb901cfc73f55866df9569ecb325a3adfe53708cdcce21e9ba635637ffef38' 
  AND token = '7g1xCrRMsr5xapCUqa//VAA35gN6Ol0xUCJI3ami8Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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