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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2dfd1a3fa3e45c2fb297613563010b877693cbc9e1dfe37dc5bfe8fed3eec7' 
  AND token = 'GJQFt8n203lEPQMHbqpZANoxi9xUIZ3rR0IIppcHNKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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