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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f31e814310707fdbea96fd7c7f6398aec398496aaf901561a6ccde6270668e' 
  AND token = 'IFG3012jTM0VS6Pw+Ia6s6UHAiIqvRucG0xKwQzoMhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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