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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b1d3901b4ab135d0a9cb08cb546f50c3dd366dbe5e2f72b136b62f5e84928a' 
  AND token = 'mjXlWDJKyzRnVinh9ezrWedb3b0NP0izcNJNENGUkhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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