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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95bf8e5f2ec746b174379c95059c03ed6610cebf8e1a7b354ba4ecf9ba272d44' 
  AND token = 'suBJBJZ1Ce2elciONHAV19kkOGqRKG7g7dE4bf/E2Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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