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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866f3acdd56dc41452a209f93c35f7f5cdacf107b74ede91d89d7f843e6a4b82' 
  AND token = 'OCe51QH5AFklM0186DRGmUSmntNM0sTR41MBB7bUUic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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