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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f65dfad156a892cf0a2da2ca24007741618c7e5aa331e9a08160e63eaa2539a0' 
  AND token = '6nKDx9nFEcFDisRr8BRFspw2WXf3iFIXUwGvj/kswaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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