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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd4c9491ebf592be7117457bf635a2f664fe6b5a667a0da53bdfc5391a546c3' 
  AND token = 'gg7G+ZCt/c5kKN8YI4pje3r2yhBge+i3cpRb4c0t/nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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