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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474186cf539c0d8633a225e88c3b7649b4e2aba8690137c1d01afac1e4c120ea' 
  AND token = 'oh6viPh7uJdqH6eooipUI5vXAATx0MRzBHNjVPcDs0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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