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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b17cc7dd724704482a4297944e6e8ea2e4adfb991d2467fe52fa45a09bb02bd' 
  AND token = 'iBKJ6GnBLGsEnz8nEYdDjmXjrPDqhD0vlVnurc72SS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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