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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0d3083035c22de1baeb38812a9c30a4682aaaff67f46bf8ea16cd3c9076de8' 
  AND token = 'gke2aT3F6/97QSmpkYxThXRcc7IyArUSCw9aVdIugD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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