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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3838c7e2081a619d1710d5633024278abd8754af3576059b3605ec41c5d97637' 
  AND token = 'tOh9iUe4eKS+k79WKxHg+NHW79DUquOEzaF1CP8/iSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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