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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68019669356d9b49754d25ed6d05a290cf9c0fc4964e187992472e5a46e8871f' 
  AND token = 'DUZd6Vd3l7gKkefmSCEz8N52ite0SnP4haF1RSLK3N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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