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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4807836829f2e075d8f28476ddee03c2e926d029fa9f5a9c56d04ae46580a6dd' 
  AND token = 'xF93mpn4WVMkJq3hSSygq38HV4YRL8WlJa3AJbM0czg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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