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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08136e7e4f7026686bf8c25371ddeb04a3820b4d07e9bb0983844395e6fec88' 
  AND token = 'mVC3DrzB50DrxD3paeJF1+7hxLxUIIph24UBPwst4D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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